Conduit-bending mechanism



Dec. 21 1926. 1,611,682

J. SCHREINER CONDUIT BENDING MECHANISM Filed Nov. 27, 1925 2 Sheets-Sheet 2 M15/@5565 WM Patented llera El, litlilf,

CONDJT-BENDNG llitEC/ZAIYISM.

Application filed November 27, 1925. t No. Tfifl.

My invention, in general, relates to bendthe leg l has toiimed thereon a guiding ing` apparatus.; and more particularly to conrail 25, which rails serve to guide the move duit bending mechanism. ment ol the cross-piece 22. Attached to the The object ot the present invention is to crosspiece 22 an ent. ot a threaded inemA 5 provide simple7 inexpensive and compact her 26 which extends through a threaded 60 bending mechanism particularly adapted aperture in the upper part of the part ll.

for use in conjunction with pipe vises. rllhe upper end oit the threaded member o3' In the accon'ipanying` drawings, screw 26 is adapted to have inserted there Fig. l is a plan view of a pipe vise havin or attached thereto an element tor turning` applied thereto my novel conduit bending the same in ai manner well known to 65 ingr mechanism; those familiar with the present art. 0b Fig. 2 is a front view of the mechanism viously, by turning the screw or threaded illustrated in Fig. l; member 26, the jaw 2l may be moved with Fig. 3 is a side view of the mechanism il respect. to the stationary jaws 20. l5 lustrated in Figs. l' and 2; The lower part .l2 of the pipe vise l0 has 70 Fig. l is a sectional view taken on the cast integral therewith an extension orbloclc line 4h4- ogt Fig. l; and 50, (Fig. 3). This block 30 has formed there Fig. 5 is a detailed view of a bending;v 1n two intersecting1 rectangular apertures bloclr or die. 3l and 32. rlChe aperture 32 is disposed in Referring now to the drawings in detail, substantially a vertical plane and the apen 75 in which lilte reference numerals designate ture 3l is disposed in a longitudinal plane similar parts throughout the several views, at right angles to the aperture 32. rlhe l0 denotes generally a pipe vise which may block 30 is equipped with an apertured lug be of any suitable or usual construction and 33 which may be used with lugs 34e on the comprises an upper part ll and a lower lower part l2 to tasten the vise and bench 80 part l2 The upper part is pretering mechanism to a suitable bench or other ably Ecl-shaped and is adapted to have one supporting platform. oit its leegs pivoted to the lower part l2. ln Associated with the block is what l 2 l have illustrated the legl?) ot' the shall hereinafter refer to as a die block 35. 0 lil-shaped part ll as being pivotally attached rlhis block is equipped with ain arcuate edge 85 to the lower part l2 by a bolt and nut 14. lt having` formed therein an arcuate groove is ot course evident that by removing` the bolt 37, which groove is ot the same contour as and nut 1l the lol-shaped part l1 may be that of the bend desired. turned around and its les; 13 may be sellhe die block 35 is also equipped with cured to the other side of the lower part l2. arcuate shaped aperture 38 which tends to 90 The other leg 15 of the 'tl-shaped part l1 lighten its weight. The block 35 is detachhas pivotally attached thereto at 16 a latch ably mounted to the bloclr 8O and may be 17 adapted to engage with a projection 18 on replaced by other sized blocks ot similar the lower part l2. By lifting the latch 17 construction, obviously the size ot the block awa'y from the projection 18,` the ll-shaj ed used depends upon the type ol1 bend desired, 95 part 1l. may be moved about its pivot bolt Each block 35 is provided with a rectangular le into a tilted position to permit pipes or shaped aperture l0 which is substantially conduits to be placed on the lower aart l2 the same size and contour as the apertures or removed therefrom, as the case may be, 3l and 32 in the block 30. In Fig. 5 l have with facility. illustrated a dillerent size of block which. 100

The lower part l2 is equipped with a pair with the exception of the degree ot bend, of stationary gripping jaws 20. and the upis substantially like the block illust-rated in per part is provided with a movable jaw 2l 3. 'lhere'liore7 it is the belie'iE that the disposed in a vertical plane passino; through same reference numeral may be used to the space separating the pair of jaws 20 designate similar things in both the blocks. ot the lower part l2. rlhe upper jaw 2l ln dig. l l have illustra ed the bloeit 35 is secured to a er0ss-piece 22 adapted to slide being; disposed in substantially a vertical up and down in between the two legs 13 position win it* aperture Zl() in alignment 5 and 15 or the lll-shaped partll. The leg- 13 with the aperture in the block 30. The n() has formed thereon a guiding rail 24 and block 35 is held to the block 30 by a recform upon .which the vise is mounted.

,being grippedby the jaws'ot the pipe vise The conduit" is disin .the .usual ,mani-ier.

.posed in a Asubstantially horizontal posiition and rests in rthe .Oiroove .4t2 of the die block 35.

In Fig. 4 I have illustrated indotted lines the `manner 1in ,which the block may he carried by ythe yblock .ivhen it :is .disposed in a horizontal rather than lin a vertical position. ln that event, the groove el of the die block is positionedin alignment With the upper end 4of the rectangular aperture 32 lin the extension or vblock 30. rllhe rod all is then inoiinted in a vertical position in the tivo aligned apertures lt) and 32. It is evident that although the .die jblocl; is niouiited in a horizontal plane, the groove 4:2 thereof will still be `in `alignment Wit-h the bottom of 1the vise jaws 20. `so as to accommodate the Vconduit to `be bent. rlhe rectangular rod Lll is prevented roin falling' vout oit the valigned aperture when it is disposed in a vertical position by the top of the bench or platl'i practice, I find it necessary to mount the die block in a horizontal plane when the conduit to .he bent is relatively long, so as to prevent the end ot the conduit troin hitting' Atelic floor. For short lengths of conduits., the mounting illustrated in lli 3 will. be found to be satisfactory.

Now I shall proceed to describe in detail the actuating Iineinber by which l bend conduit 45. rllliis nieinber is indicated geit Le-rally hy the reference numeral and is best illustrated in Fig. 3. lt coniprises a bifnicated arni 5l having a pair ojl` pa allel legs v52 Which are adapted to sti'laddle the die bloei; `as Well the conduit l. Rotatably mounted intermediate the legs 52 of the arni 51 is a roller 5B having a groove 5l. The roller 53 is rotatably carried on a pin mounted at opposite ends in the legs of the anni 5l. l preferably provide the legs 52 ot' the arin 5l with a plurality of apertures 56, so as to enable the roller 5&3 to be mounted in dii'l'erent positions ivith respect to the die block 35 to permit it to accommodate differentsizcs ot conduits 'The `groove of the roller 53 is adapted to accoininoi vthe top surface of the conduit 45, and the groove 37 in the block 35 is adapted to accommodate the lower surface of the conduit 45.

lthe arni.

l torni with the arcuate s 9'? in 'the die block 35 rhis si. l, the roller *5%. as will be .ily d iion oi" uiy nieclianisiii.

scribed in the g rEhe upper end o'l the ariii is .preisrahly reduced. as indicated at 6l. in order to enable an ordinary pipe section to be telescoped thereby. rthat is to mounting` a pipe such as that illus dotted lines in Fig. 3 and designated by the reference character G5 upon the reduced portion of the upper end ot the arni 5l. it may be used as a handle 'or actuating` Then, too, the pipe G5 provides additional leverage. thereby increr-,sing` the anioiint of force applied upon thc portion ot the conduit l5 being bent.

The operation ot' my bending as tolloivs ln the tirst place, the conduit vise 1li which. as has been previously nientionet, is of any usual or suitable construction, is mounted upon the bench and fastened there-y to by ineans ot the lugs B-l and the 33 on the block 80. Then the die block 35 is associated with the block 30 in either its ver tical or longitudinal position. depending upon the size, or rather the length ot the conduit being bent. The size of the block employed, will depend upon the degree ol bend desired. lt is evident` that the only difference in the block 35 will be in the shape ot the arcuate shaped groove 37 thereof. Ry employing' rny novel die block. conduitrnay be lient into any shaped angle desired. rllhe size oit the angle ot course will depend upon the contour ot groove -i" of the die block.

.fitter the die bloeit is mounted and phred upon the block 30 and held thereto by the rectangular rod 4l. sect-ion ot conduit to be lient is placed thereon With au und attending' through the jaws of the vise errer.' or threaded inemher is actuated to bring' the jaws ot the vise into tighteng'ageinent with the section olf conduit fastened thereto to tightly hold it in place.

Then the actuating ineinber 50 is placed in position with its legs 52 straddling the conduit and the bloclr 35, and the pin 6l is inserted therein and in the bore in the die block thus providinga pivotal mounting for the actuating` ineinber. A section of pipe is then placed over the reduced end 64; of the niechanisiu itl() lill) iso member 50, eration.

Then the operator puils the section ot pipe in a direction. away from the vise l0, causing the roller 53 to bend the portion of the conduit contacting therewith downwardly, causing it to assume the contour ot' the groove 37 in the die block 35.

To remove the bent pipe, the vise jaws are released by the screw 26, and the actuat ing member is removed from the die block 35. The bending` mechanism is then in a position to receive the next conduit to be bent. Should it be desired to use a diiierent size die block, the one in use previously may be easily detached` from the block 30 by removing the holdingrod il and another die bloei; may be substituted therefor and the rod 4l inserted therein.

Now it is evident that during the process or" bending the pressure is applied to the conduit to progressively bend same. That is to say, the pressure is moving in an arcuate path and hence must be progressively applied to the conduit. Contemporaneously with and during the aforesaid pressing action, the conduit is confined peripherally at the point the pressure is appiied to thev conduit to prevent distortion of the conduit and to cause it to maintain a symmetrical crosssection throughout the bend.

In practice, I iind that with my novel bending mechanism, I am enabled to bend conduits into many diiierent shapes without crimpiuav or distorting the circular shape ot the conduit at the place ot the bend. This is a decided advantage over prior bendingmechanisms tor use in conjunction with conduits, since, from eXperience, l iind that with the use of the prior types ot bending apparatus the conduit was usually badly distorted at the place of the bend.

l desire it understood that although I have disclosed and described in detail the preferred embodiment ot' my invention, that the invention is not to be limited thereby, but only in so far as defined by the scope and spirit of. the claims hereto attached.

I claim r- 1. In combination, a vise tor gripping a conduit to be bent, an extension associated with the vise having a pair of apertures disposed at right angles to each other, a die block having an aperture, a rod insertible Juttine` it in a condition for o 3- l n in the aperture in the bloclr :tor connecting it to the extension through the apertures in the said extension, the said block being attachable to the vise in a horizontal as well as in a vertical position, the said die block having an arcuate groove for delining the shape into which the conduit is to be bent, an arm havn ing a. pair ot spaced legs straddling the said die block, a roller intermediate the said legs` revolvably carried thereby and contacting with the conduit to be bent, and a pivotal connection between the legs of the arm and the cie blockv for enabling the arm to be moved in an arcuate path to cause the roller thereof to press the portion of the conduit associated therewith into an arcuate shape deiined by the arcuate groove in the die block.

2. in combination in a conduit bending device, a vise for gripping conduit to be bent, an extension associated with the vise having a pair of apertures disposed at right angles to each other, a die block having an aperture, and an element insertible in the aperture in the block for connecting it to the extension through the apertures in said extension, the said block being` attachable to the vise in a horizontal as well as in a vertical position;

3. ln combination in a conduit, a vise including a plurality oi' jaws for gripping conduit to be bent, a die block having an arcuate shaped groove in alignment with the jaws of the vise, and means ociated with the vise tor enabling the die bioclr to be connected thereto in a plurality t di'icrent positions, said die block being of given size and being readily detachable trom said vise to enable its replacement by a ciimerent size of die block.

in combination in a`conduit bending device, a vise including jaws for gripping a conduit to be bent, and a die bloclr having an arcuate shaped groove, one end of which is in alignment with the jaws of the vise to receive a portion ot the conduit gripped by the vise jaws, said die bloclrbeing adapted to be used in conjunction with the vise to enable the conduit to be bent in two different planes.

In witness whereof, I hereunto subscribe my name this 23rd day of November, 1925.

JOHN SCHREINER.

device for bending 

